AQI: Good (0 - 50)
Air quality is considered satisfactory, and air pollution poses little or no risk.

AQI: Moderate (51 - 100)
Air quality is acceptable; however, for some pollutants there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.

AQI: Unhealthy for Sensitive Groups (101 - 150)
Although general public is not likely to be affected at this AQI range, people with lung disease, older adults and children are at a greater risk from exposure to ozone, whereas persons with heart and lung disease, older adults and children are at greater risk from the presence of particles in the air.

Forecast Discussion: Thursday and Friday, an upper-level ridge of high pressure will build over northern California, reducing mixing and producing sunny skies and temperatures in the mid-90s. These conditions will enhance ground-level ozone formation in the Sacramento area. Therefore, despite light to moderate onshore winds dispersing pollutants each afternoon, ozone levels will be high-Moderate on Thursday and Unhealthy for Sensitive Groups on Friday. Saturday, an upper-level trough of low pressure will form over the region, enhancing atmospheric mixing. In addition, light to moderate onshore winds will aid pollutant dispersion. However, warm temperatures will continue to support ozone production, and pollutant carryover from the previous days will be high. As a result, ozone levels will remain Unhealthy for Sensitive Groups.